Locomotive



(N0 Model.)

T. s; TEW. LOGOMOTIVE.

Patented Apr. 1, 1884.

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N PETERS, Phnlomhugnpmr. washington, U. c,

UNITED STATES l PATENT y OEEICE.

THOMAS s. frEw,"oE BIGRAPIDs, MICHIGAN.

I oCoMoTwE.

SPECIFICATION forming part of Leners Patent1vo-z9aosaaated Aprn 1,1884.

Application filed June 9, 1883. (No model.)

To all whom it may concern: j `Be it known that I, THoMAs S. TEW, of BigRapids, in the county of Mecosta and State of Michigan, have inventednew and useful Improvernents in Locomotives; and I hereby declare thatthefollowing is a full, clear, and exact` description thereof, Ireference being had to the accompanying drawings, which form a part ofthis specification. x

This invention relates to certain new and useful improvements inlocomotives especially designed for heavy work; and v The inventionconsists in the peculiar construction and arrangement of parts, by meansof which the traction-wheels are converted into drivers, connected foreand aft with the main driver, which is connected to the cylinders, asmore fully hereinafter described.

`Figure 1 is a side elevation. Fig.,2 is atop plan ofa section of theparallel rod at its point of connection with `the connectingrod.4 Fig. 3is a side elevation of the connecting-rod detached and enlarged. Fig. 4is an `elevationl of the driver, double crank, and sections of the foreand aft connecting-rods. Fig. 5 is a front elevation of the'main driver,showing its wrist-pin, double crank, and connecting` rod connections.

In the accompanying drawings, which form apart of this spciflcation, Arepresents the main driver: provided with Wrist-pin B, and is connectedwith the steam-cylinder C by means of the connecting-rod D inthe usualmanner. Pivotally secured to the outer end 4of the wrist-pin B is thearm-crank a; and b b are connecting-rods, one of which is pivotallysecured to each end of the double crank a, the connecting ends of suchrods being bifurcated, as shown in Fig. 5, so as to embrace both frontand rear faces of the crank, to which they are pivotally secured bysuitable bolts or pins. One of these connecting-rods, b, connects suchcrank to the traction-wheels under the fore part of the engine, andanother makes a similar connection with `the wheels under the engine,and as both connections are alike a description of one will besufficient. The traction-wheels E are shown in pairs, two being underthe front and two under the rear of the locomotive. These wheels areconnectedtogether by parallel bars d in the usual Inanner of formingsuch connections betweenthe drivers, and the connecting-rods d arepivotally secured to the vertical center line of the parallel bars bymeans of the joint c, plate c, and bolts, as more fully shown in Fig. 3,the joint c being so constructed as to allow sufficient play for anyinequalities in the surface of the road and for curves, without bindingso as `to interfere with the proper working of the device. Thepeculiarity of this joint is that itallows the rod to yield laterally,Where` by the binding effect, which would be otherwise caused in turningcurves, is effectually 'done away with.

By my invention all the Weight of the engine is utilized upon thetraction-wheels, the latter being converted linto drivers, and hence thelocomotive will be found very efficient for heavy work.

I attach importance to the pivoted doublecrank arms a because theirconstruction al lows them to move slightly in passing curves, the one onone side turning slightly in one direction, while the one on the otherside turns about equally in the opposite direction; and thus thecrampingand binding, which would occur from the moving of the trucks inturning curves, is prevented by the compensation given by the movementof the crank-arms in opposite directions on their centers.

I do not wish to limit myself to theprecise number of wheels orconstruction shown, eX- cept where especially indicated in the claims,as it is evident that the number of wheels or the construction may bevaried Without departing from the spirit of my invention.

I am aware that it is not new to provide a connecting-rod with a jointadapted to' yield vertically, and make no claim to any suchconstruction.

What I claim as ny invention is 1. The combination, with the maindriving wheel and crank-pin of a locomotive, of the double-crank arm a,pivotally connected there with, and the rods b b, connected with0pposite ends of said arm, and: having their opposite ends connectedtodriving-wheels on opposite sides of the main driving-Wheel7substantially as described.

2. The combination, with the centrally-l0- cated driving -Wheels of alocomotive, con- 5 nected in the usual Way to the steam-cylinders, ofthe double crank a,' upon the end of the Wrist-pin B, connecting-rods b,the joint c, the parallel rods cl, and the traction-Wheels E, Jhe partsbeing constructed7 arranged, and operatio ing substantially as and forthe purposes specified.

8. The combination, with the main and secondary driving-wheels of alocomotive, of the connecting-rod b, having one end provided with ajoint, c, adapted to yield laterally, and 15 connected at its oppositeends with said main and secondary driving-Wheels, substantially asdescribed.

THOS. S. TEW. Vitnesses:

H. S. SPRAGUE, E. ScULLY.

